Question 747039
(1-sin^2(x))/(sinx) *sec(x)=√(1-sin^2(x))÷sin(x) 
Start with left side:
{{{(1-sin^2(x))(sec(x))/(sin(x))}}}
{{{(cos^2(x))(1/cos(x))/(sin(x))=(cos(x))/(sin(x))=sqrt(1-sin^2(x))/(sin(x))}}}